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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db0b50eef707faa79c1438d506a88cffe6d5aba3ea0713b630bf97f168e34c2' 
  AND token = 'PjQV42/NF/S7Y9ToLDIEkjIsZc7NBEgBPuBrvrx4Fic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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