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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616b9eb0cc389f04ffc275a1857c03222c0e324bc3f28d39cbbc59402c331125' 
  AND token = 'SIb7D+gMDIjyF9szWCzKPndHk5cNrNkL0dzCtOG9mhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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