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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d34ca0bad1cc4d42617b38d48b574eb198a91b11171754d5c39faac27b71c1' 
  AND token = '37tWO/BGzmsgz3ur5CdrZeQoEJXGLwdCAjgbac6k+fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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