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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25404bf37455e90ed7e1095a89d23c526b932892133f4eaed129c2ca287f1abc' 
  AND token = 'JJ/rfDux5SOxvjC4SNwrCbyoj8EQ86u7WKa5RNTx0Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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