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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c819f73ca4d8c34eb50ed89f0c185a73e3f2c795d4f31f1b42abdd9a92ba05e' 
  AND token = '3eVxgd6ZDihHximajEaLswuXkZ2uPLTfGznTgYLgg64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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