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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06871514db67b417da94c07b3eae04866f540e8be94f4df5246c3dfb7cb7963b' 
  AND token = 'JQ1oobjcHFat1LXBxN5z5ES64uBxrYlo94VfpLwVEP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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