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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6917a0c157b6760957da49e3a5ffb7c15dcf81d03595a981c031b58b2c7e4a' 
  AND token = 'wGbEG+9owMRA3whAiqnH7LfrXxjjWARDmIVgVoo5crs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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