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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f135c48ffd1753663e27a224c813bd36932e9e5e09637b42f64e8519dfbbb71d' 
  AND token = '6RsUCunnW380eQCYCqMI8JSzK+8CW05rEZk6BYrs94g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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