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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4886c6d0faa3eb2097a291f8d2e079a27bd0962c4eec71ca3be7cb52d7d41188' 
  AND token = 'iAkVy6e9AgoZm8QpAr8ylD4dATktzeyo+ctPUHBpKlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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