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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a69e967d0eedcb0397859c019c4ce0824ebda4fea941f2b52840bd78e59dc2' 
  AND token = 'x8A6CTvj4KK8ouvAlduVBcYpw0+Z0vme9M11+3iGfe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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