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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a8bb5ad0b2e7263329d6428907265b4d19c8a93f3a618b0fb177a826aecc1a' 
  AND token = '9ypeFJIPZWXZmyJ8Wk4WUG3SUonJnXAfbws3y2tfSP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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