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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b0904e6801a2eeeffc8f4c4ea8e40f4731b138a15150550eb1aebbcc2a9b66' 
  AND token = 'h9sfll6oR0i+dfZXHX0iVSfbyb3f7pay5Fw1eYCsbtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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