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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a055c56bc5d36f7826ba4f03b54035d03257637787cc0b329ffa0a8b61138a3c' 
  AND token = 'ka7X7+CGCPmlt7cdfSA7HzkbUP58IVSBSBIJ/81VM0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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