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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6e8449a8a1be12e28a1a10a012c6e70cc6670ce90724b3be0d0447292906b1' 
  AND token = 'A+UTpxxrihxw50fdtK9Drl+P98SbuWBDzi5EC2Mdv38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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