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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615541e9f7cdce6c2fa7aa369ef63acfdf943206477bc335de27f00cbaa69703' 
  AND token = 's9tQyHDFWYIby3Zd3/62dV2Sj7hHpqPzk+/QLzhWL0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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