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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdaf55226c9902906f77ef9af2e40fd0675255fe5cc0e2351f3f1915ba0c85b' 
  AND token = 'KdXfsgR3m2vQXjYfW1wMeubd7svyOv51zlunTe/CdtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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