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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d61d9123f14bf6158b8f99eb420283d16412f291f3dd99de53a966e5f2d89e7' 
  AND token = '+UNq5WfBFlf3p5wq2N423XNpR6lIsPa0UbYisrisYY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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