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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81503a67c9f4ab6d94ddaf6daf73aa5c6368ca6c5d79f4867a7cfc590ac07d72' 
  AND token = '+a0VPMOEFetRnDdCZFwIxv0ZjHKEX3Yk4Fnr1MuxA7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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