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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e52da68e2c0065393c801434fdb47ce2a66766f49d84f9111263fff6f4cb00d' 
  AND token = 'fWX2yar5Xf6cbNY8aLDzuz03x8HPILex4VwBnIBy/Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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