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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58a51e5eecd5514125670ff32d7ad2478ecb25601992a798ea392f6ad96081e' 
  AND token = 'XkX4P6uCCoWThCXrXxmmh3is6rvMkt9TIDP3fPaCH5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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