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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e019afcc77806ba38767f415c7c41ee3dccd2de86c6b91da897108d84c4f4381' 
  AND token = 'EytQVbLRRVMmeU/9Sq2MmfdUxPOm93kSRxLAGH3z3uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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