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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89af446227b0e7238dbf9d87e3e5f54603a8b45b63b50fcf182caf7d15cffe8d' 
  AND token = 'tT8NOOItPGbj9v3mbQl8MDGKf2Oeh69KKvGxxgK66s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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