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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3368acbe3d10fb5b1929b91a3f3c6e23564ebe5ebeac3c63fc68b1922e4e4cb3' 
  AND token = '/KlZ8Fq/aEaCD5u0QKTrZ0FScFsMMe9nk6l+zDEppQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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