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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54871952d0d758fd7c7b3b2ec3dcc060a135ee4abbddac5525b08a2a73bb9499' 
  AND token = 'dYsoOh2+ApWlLJV7r7Tfnhht2udCVD/wmWehXJDIEWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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