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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6205e4626f164a6a08a6bdcee44b934951b1ca199259364b68802e9980152933' 
  AND token = 'TeZvg3pjT4z1fc9MVv58R8dU2ATH2bv+apm3DtIHjno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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