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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea69d4a9217144ea156d9afd6036f478adfa3572eb4f588d6de050cbc49050c' 
  AND token = 'sQVELskT7A4AS2O4l27korYgkoqrNPufD2LZ2WC3q44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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