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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58ba74a7ddf11148f8f7d7e83dd84a3bac7563c6e61220899ab8c72067b9b6d' 
  AND token = '10612aMEWS4p5NYi8JIlbq5q2v/lNslqVbXC1QY6X/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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