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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b2b4d5ec5900109b010a69f134eea6f0978c5ad808e9cab24a620b8e3b904f' 
  AND token = 'FT7VcpW4C081DdSnED827LtC+4xSEtDytaJe9niTPZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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