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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c6b23d6f21a790d40fd07cd4a510080dce6d4424a4f0ec99abe7b72ec5d0f9' 
  AND token = 'VOIlsUeQrm9IP9H3OAsCuyOyniDpRXeciA10QuD9Sho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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