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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01bc17c222ed83cd9ac2103e2e5ca1f866fabb2e19abd6e899dbe63cf59c7da' 
  AND token = 'cjIk4vECUxgKavJXP8K3px9pTd9F+wF9ZmEIdMLCmMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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