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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f3d579a3fe9f277246cdae56e7c0431517f27ec3ef8e211db7ee56dc74cbb6' 
  AND token = '3+fo0MpOCGvWc6Wx+pTrQqJE768E3loe57RHjBwWiVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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