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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e8d7f4d4fc9a6b9e4dc554f0fb0c03d7a13975b63241b76ab2c8ad96e9d0de' 
  AND token = 'mVuzRErMX2MiOn3VsyixTwN9f2dMwnG0cb6piVJFezQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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