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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27009c7f795bbfab014d6bff4b8892902319820092fc7531a8c4b786ba236cb9' 
  AND token = 'HlE6WZ+UHt9QQuCPN4B79Z2w5+UyU6t1dArk2WY5yVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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