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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90e5d40d3e7e0a49b996083a189e5ed259a78d88dab06bd57b3cb5f8858d80b' 
  AND token = '/MjiqNQnMZzo/ML1HSi+IjEWaGarxrlqw+0RDwlXZpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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