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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b51341e978fb5dc2b422bf9bf2ef6779a72ca6359435342d425b5202ca61ca' 
  AND token = 'vilWlrb8nc8vI1piuv/TFhDzuku8fH0fZxofmypPz6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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