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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1702bb9e9a9c348e02ce4635cce1858951b782ba777e86f6b1e75f242c93bbe9' 
  AND token = 'JScCMu+WYteVsVZEmmqr7QQnJ44AYx8c0z+y+Ir32F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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