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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dab9d895a2dfd82cdf740fd6186120ea5c88e87e520dc5f849f454bc25551d' 
  AND token = 'VH6l2TnH7Pi9SZnza2R3jcQBasZus+Wt/Om/8vzf7Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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