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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136da08c4c2e6c0580c546749a43a1d71427e63eb9511091d7d1877ff2adf2e7' 
  AND token = 'oImdpHY2eLeniHZPZQKCGTYl6BTxNE45f8MhwXpl1Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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