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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10d4228750c8d324af58ae9d6b8511ea96a6fb92f277b45799252e55f52a9a9' 
  AND token = 'J73HfBSVcAQm9MYejd+IcDKtm7Hl93OxrlScw46eKG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}