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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430b52fd0b446aafe3dee9330b60aec2fd40afcbd30dfafb030512f377d4a412' 
  AND token = '8SDvoH+NzgQuKk1E3mkxVSkynrJy6eLnZGlKk8AzwJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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