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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6ac259a3202de90dbfba8d22f02d1e7542daf1cff6435cec6fdd96b020ef72' 
  AND token = 'PZKStrBx7OQOUQD9Z9f44sGZby7tF2niwE+KJg432h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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