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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6c33c6985efe37cff3354dd282ee5e7d30557a93022af785afa86da3271087' 
  AND token = '1oD8PWfIcPHp9hCbtiPdRXWPpw+ieNeZ0x8r1fcbeBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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