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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1234aef9f9c7e405f1515b8a2583211b032f6a3885d27781c4a0c0792fd6f8' 
  AND token = 'xsub10PWFtJn2Z6BeHLJGiI1odWC0/5lDTETDcUMYH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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