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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be14bdc397184d3da069855f73448d216e751216538d4491eb5a009a88ff80e2' 
  AND token = 'XcKyn356FJ7NS4dvWGzvid7SAB2L8iBw9mMdeLqOaJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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