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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79aba994e97c2a6c8fba1869426c2adfd45ff7f43ec448b9c44605bebac00b4c' 
  AND token = '/aAz61wPF00mgEVxXH1S7EVRV25PZLnUnwxH1Dtq/BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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