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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6f6020f7631d1293cc7b62ce03e363b9e0ebc7d91a508030de107e66bf10b1' 
  AND token = 'Tgd3/I6SUUw3mK2FhbNzrAe32t3x16lyOxrP9DEONzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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