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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3313970e82f76c13ecd53a2f5118be4138809ea51cf4b4910747f18190f2eca' 
  AND token = '1DLroTlM3u1IBFfjA/h+xnZBMpOm7zWSNNaZkOAQsAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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