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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2d0d1d396ba34a7a2c5690e07f6e3d06ea5c2f536b9147dd8d12a8515e5cc3' 
  AND token = 'Al52xHKuqqPabaMqCJyE3p4bGPpzw35ArwIMxWa8kfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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