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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cbb9e16e037f4e8e82b1aa1c99dc79d80cbc65cfe126778db713c2eae92faa' 
  AND token = '0Z129E6KIb9fSard5WMVje+l3Rmmn4lcXkpis+OSV7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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