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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e1b2d9d78b71fd92347ff7ce04a89c3d27e70e6e102b154dfc0ea507e21554' 
  AND token = 'n5d0K/nc5M8fDThrD7Njm4faZrhjpcccnRcywDECTkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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