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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b20cd5d3dbabbdeb2187c4f0bf02c7c5bcfc356d72c9cc4051bb5123acb6a0e' 
  AND token = 'e977nhEG3zhWEwdCmKqz3VBTpqW7wr4eq46DtoThjcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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